window-maximize

<svg fill="currentColor" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg"><path d="M64 64C28.7 64 0 92.7 0 128L0 384c0 35.3 28.7 64 64 64l384 0c35.3 0 64-28.7 64-64l0-256c0-35.3-28.7-64-64-64L64 64zm24 64l336 0c13.3 0 24 10.7 24 24s-10.7 24-24 24L88 176c-13.3 0-24-10.7-24-24s10.7-24 24-24z"/></svg>

<i class="ti ti-window-maximize"></i>

ti ti-window-maximize

<i class="ti ti-027305"></i>

ti ti-027305

<svg aria-hidden="true" focusable="false" fill="currentColor" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg"><path d="M64 64C28.7 64 0 92.7 0 128L0 384c0 35.3 28.7 64 64 64l384 0c35.3 0 64-28.7 64-64l0-256c0-35.3-28.7-64-64-64L64 64zm24 64l336 0c13.3 0 24 10.7 24 24s-10.7 24-24 24L88 176c-13.3 0-24-10.7-24-24s10.7-24 24-24z"/></svg>

<svg aria-hidden="true" focusable="false" fill="currentColor" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg"><path d="M64 64C28.7 64 0 92.7 0 128L0 384c0 35.3 28.7 64 64 64l384 0c35.3 0 64-28.7 64-64l0-256c0-35.3-28.7-64-64-64L64 64zm24 64l336 0c13.3 0 24 10.7 24 24s-10.7 24-24 24L88 176c-13.3 0-24-10.7-24-24s10.7-24 24-24z"/></svg>

https://cdn.jsdelivr.net/npm/@ticnob/icons@1/icons/window-maximize.svg